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+//Exa 8.19

+clc;

+clear;

+close;

+//Given data :

+lambda=1.3;//in um

+lambda=lambda*10^-6;//in meter

+Id=16;//in nA

+Id=Id*10^-9;//in Ampere

+ETA=90;//Quantum Efficiency in %

+RL=1000;//in Ohm

+P=1.2;//in uW

+P=P*10^-6;//in Watts

+B=80;//in Mhz

+B=B*10^6;//in Hz

+T=20;//in degree C

+T=T+273;//in kelvin

+q=1.6*10^-19;//in c

+K=1.38*10^-23;//Boltzman Constant

+h=6.63*10^-34;//Planks constant

+c=3*10^8;//in m/s

+Ip=(ETA/100)*q*lambda*P/(h*c);//in Ampere

+Iq=sqrt(2*q*Ip*B);//in Ampere

+disp(Iq*10^9,"Mean square quantum nooise in nA : ");

+I_dark=sqrt(2*q*Id*B);//in Ampere

+disp(I_dark*10^9,"Mean square dark current noise in nA :");

+It=sqrt(4*K*T*B/RL);//in Ampere

+disp(round(It*10^9),"Mean square thermal current noise in nA :");
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